Measurement of pH by NMR Spectroscopy in Concentrated Aqueous Fluoride Buffers |
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| Authors: | Gerken James B |
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| Affiliation: | Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, WI 53706-1322, USA |
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| Abstract: | An NMR spectroscopic technique has been developed to give rapid, accurate pH measurements on tenth-milliliter samples of concentrated acidic aqueous solutions buffered by fluoride ion in the pH 1.5-4.5 range. The fluoride 19F chemical shift has been calibrated as a function of pH at 0.1 and 1.0 M concentration by reference to an internal 3-fluoropyridine standard. Subsequent measurements of fluoride buffer pH required no additives and only two NMR spectra in the presence of an external reference standard. |
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| Keywords: | pH measurement Aqueous fluoride buffer Fluorine NMR spectroscopy |
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